Thread: A couple of new toys comp seating die and Comparator for Measuring sholder bump etc

I have the same gear and I definitely get variation between rounds even after the seating depth is all locked off. I can’t remember off the top of my head but I think the variation would be similar to yours above. I have always just figured that with such tiny measurements there must be so many minute variations such as bullet ogive position, spring back when seating, friction between projectile and case neck, that some variation in measurement is inevitable. The next thing to do is shoot them I guess and see how accurate they are!